We receive various information from our surrounding environments subconsciously. In relation to these kinds of information, ambient media is regarded as the environmental media which convey information around our awareness. It is called peripheral interaction which is the method of transmitting information unconsciously using peripheral awareness. This research evaluates the efficiency of peripheral interaction and shows the important elements for designing peripheral interaction systems to make PeripheralSoundSystem that transmit weather forecasts information by peripheral interaction of sounds. Furthermore, we also conduct a research regarding user’s awareness or state of mind when using this system.